diff options
Diffstat (limited to 'arch/sparc/kernel/mdesc.c')
| -rw-r--r-- | arch/sparc/kernel/mdesc.c | 1354 |
1 files changed, 1354 insertions, 0 deletions
diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c new file mode 100644 index 000000000..ecec6a616 --- /dev/null +++ b/arch/sparc/kernel/mdesc.c @@ -0,0 +1,1354 @@ +// SPDX-License-Identifier: GPL-2.0 +/* mdesc.c: Sun4V machine description handling. + * + * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/memblock.h> +#include <linux/log2.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/miscdevice.h> +#include <linux/bootmem.h> +#include <linux/export.h> +#include <linux/refcount.h> + +#include <asm/cpudata.h> +#include <asm/hypervisor.h> +#include <asm/mdesc.h> +#include <asm/prom.h> +#include <linux/uaccess.h> +#include <asm/oplib.h> +#include <asm/smp.h> +#include <asm/adi.h> + +/* Unlike the OBP device tree, the machine description is a full-on + * DAG. An arbitrary number of ARCs are possible from one + * node to other nodes and thus we can't use the OBP device_node + * data structure to represent these nodes inside of the kernel. + * + * Actually, it isn't even a DAG, because there are back pointers + * which create cycles in the graph. + * + * mdesc_hdr and mdesc_elem describe the layout of the data structure + * we get from the Hypervisor. + */ +struct mdesc_hdr { + u32 version; /* Transport version */ + u32 node_sz; /* node block size */ + u32 name_sz; /* name block size */ + u32 data_sz; /* data block size */ + char data[]; +} __attribute__((aligned(16))); + +struct mdesc_elem { + u8 tag; +#define MD_LIST_END 0x00 +#define MD_NODE 0x4e +#define MD_NODE_END 0x45 +#define MD_NOOP 0x20 +#define MD_PROP_ARC 0x61 +#define MD_PROP_VAL 0x76 +#define MD_PROP_STR 0x73 +#define MD_PROP_DATA 0x64 + u8 name_len; + u16 resv; + u32 name_offset; + union { + struct { + u32 data_len; + u32 data_offset; + } data; + u64 val; + } d; +}; + +struct mdesc_mem_ops { + struct mdesc_handle *(*alloc)(unsigned int mdesc_size); + void (*free)(struct mdesc_handle *handle); +}; + +struct mdesc_handle { + struct list_head list; + struct mdesc_mem_ops *mops; + void *self_base; + refcount_t refcnt; + unsigned int handle_size; + struct mdesc_hdr mdesc; +}; + +typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64, + union md_node_info *); +typedef void (*mdesc_node_info_rel_f)(union md_node_info *); +typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *); + +struct md_node_ops { + char *name; + mdesc_node_info_get_f get_info; + mdesc_node_info_rel_f rel_info; + mdesc_node_match_f node_match; +}; + +static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, + union md_node_info *node_info); +static void rel_vdev_port_node_info(union md_node_info *node_info); +static bool vdev_port_node_match(union md_node_info *a_node_info, + union md_node_info *b_node_info); + +static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, + union md_node_info *node_info); +static void rel_ds_port_node_info(union md_node_info *node_info); +static bool ds_port_node_match(union md_node_info *a_node_info, + union md_node_info *b_node_info); + +/* supported node types which can be registered */ +static struct md_node_ops md_node_ops_table[] = { + {"virtual-device-port", get_vdev_port_node_info, + rel_vdev_port_node_info, vdev_port_node_match}, + {"domain-services-port", get_ds_port_node_info, + rel_ds_port_node_info, ds_port_node_match}, + {NULL, NULL, NULL, NULL} +}; + +static void mdesc_get_node_ops(const char *node_name, + mdesc_node_info_get_f *get_info_f, + mdesc_node_info_rel_f *rel_info_f, + mdesc_node_match_f *match_f) +{ + int i; + + if (get_info_f) + *get_info_f = NULL; + + if (rel_info_f) + *rel_info_f = NULL; + + if (match_f) + *match_f = NULL; + + if (!node_name) + return; + + for (i = 0; md_node_ops_table[i].name != NULL; i++) { + if (strcmp(md_node_ops_table[i].name, node_name) == 0) { + if (get_info_f) + *get_info_f = md_node_ops_table[i].get_info; + + if (rel_info_f) + *rel_info_f = md_node_ops_table[i].rel_info; + + if (match_f) + *match_f = md_node_ops_table[i].node_match; + + break; + } + } +} + +static void mdesc_handle_init(struct mdesc_handle *hp, + unsigned int handle_size, + void *base) +{ + BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1)); + + memset(hp, 0, handle_size); + INIT_LIST_HEAD(&hp->list); + hp->self_base = base; + refcount_set(&hp->refcnt, 1); + hp->handle_size = handle_size; +} + +static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size) +{ + unsigned int handle_size, alloc_size; + struct mdesc_handle *hp; + unsigned long paddr; + + handle_size = (sizeof(struct mdesc_handle) - + sizeof(struct mdesc_hdr) + + mdesc_size); + alloc_size = PAGE_ALIGN(handle_size); + + paddr = memblock_alloc(alloc_size, PAGE_SIZE); + + hp = NULL; + if (paddr) { + hp = __va(paddr); + mdesc_handle_init(hp, handle_size, hp); + } + return hp; +} + +static void __init mdesc_memblock_free(struct mdesc_handle *hp) +{ + unsigned int alloc_size; + unsigned long start; + + BUG_ON(refcount_read(&hp->refcnt) != 0); + BUG_ON(!list_empty(&hp->list)); + + alloc_size = PAGE_ALIGN(hp->handle_size); + start = __pa(hp); + free_bootmem_late(start, alloc_size); +} + +static struct mdesc_mem_ops memblock_mdesc_ops = { + .alloc = mdesc_memblock_alloc, + .free = mdesc_memblock_free, +}; + +static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size) +{ + unsigned int handle_size; + struct mdesc_handle *hp; + unsigned long addr; + void *base; + + handle_size = (sizeof(struct mdesc_handle) - + sizeof(struct mdesc_hdr) + + mdesc_size); + base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL); + if (!base) + return NULL; + + addr = (unsigned long)base; + addr = (addr + 15UL) & ~15UL; + hp = (struct mdesc_handle *) addr; + + mdesc_handle_init(hp, handle_size, base); + + return hp; +} + +static void mdesc_kfree(struct mdesc_handle *hp) +{ + BUG_ON(refcount_read(&hp->refcnt) != 0); + BUG_ON(!list_empty(&hp->list)); + + kfree(hp->self_base); +} + +static struct mdesc_mem_ops kmalloc_mdesc_memops = { + .alloc = mdesc_kmalloc, + .free = mdesc_kfree, +}; + +static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size, + struct mdesc_mem_ops *mops) +{ + struct mdesc_handle *hp = mops->alloc(mdesc_size); + + if (hp) + hp->mops = mops; + + return hp; +} + +static void mdesc_free(struct mdesc_handle *hp) +{ + hp->mops->free(hp); +} + +static struct mdesc_handle *cur_mdesc; +static LIST_HEAD(mdesc_zombie_list); +static DEFINE_SPINLOCK(mdesc_lock); + +struct mdesc_handle *mdesc_grab(void) +{ + struct mdesc_handle *hp; + unsigned long flags; + + spin_lock_irqsave(&mdesc_lock, flags); + hp = cur_mdesc; + if (hp) + refcount_inc(&hp->refcnt); + spin_unlock_irqrestore(&mdesc_lock, flags); + + return hp; +} +EXPORT_SYMBOL(mdesc_grab); + +void mdesc_release(struct mdesc_handle *hp) +{ + unsigned long flags; + + spin_lock_irqsave(&mdesc_lock, flags); + if (refcount_dec_and_test(&hp->refcnt)) { + list_del_init(&hp->list); + hp->mops->free(hp); + } + spin_unlock_irqrestore(&mdesc_lock, flags); +} +EXPORT_SYMBOL(mdesc_release); + +static DEFINE_MUTEX(mdesc_mutex); +static struct mdesc_notifier_client *client_list; + +void mdesc_register_notifier(struct mdesc_notifier_client *client) +{ + bool supported = false; + u64 node; + int i; + + mutex_lock(&mdesc_mutex); + + /* check to see if the node is supported for registration */ + for (i = 0; md_node_ops_table[i].name != NULL; i++) { + if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) { + supported = true; + break; + } + } + + if (!supported) { + pr_err("MD: %s node not supported\n", client->node_name); + mutex_unlock(&mdesc_mutex); + return; + } + + client->next = client_list; + client_list = client; + + mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name) + client->add(cur_mdesc, node, client->node_name); + + mutex_unlock(&mdesc_mutex); +} + +static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node) +{ + const u64 *id; + u64 a; + + id = NULL; + mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { + u64 target; + + target = mdesc_arc_target(hp, a); + id = mdesc_get_property(hp, target, + "cfg-handle", NULL); + if (id) + break; + } + + return id; +} + +static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, + union md_node_info *node_info) +{ + const u64 *parent_cfg_hdlp; + const char *name; + const u64 *idp; + + /* + * Virtual device nodes are distinguished by: + * 1. "id" property + * 2. "name" property + * 3. parent node "cfg-handle" property + */ + idp = mdesc_get_property(md, node, "id", NULL); + name = mdesc_get_property(md, node, "name", NULL); + parent_cfg_hdlp = parent_cfg_handle(md, node); + + if (!idp || !name || !parent_cfg_hdlp) + return -1; + + node_info->vdev_port.id = *idp; + node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL); + if (!node_info->vdev_port.name) + return -1; + node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp; + + return 0; +} + +static void rel_vdev_port_node_info(union md_node_info *node_info) +{ + if (node_info && node_info->vdev_port.name) { + kfree_const(node_info->vdev_port.name); + node_info->vdev_port.name = NULL; + } +} + +static bool vdev_port_node_match(union md_node_info *a_node_info, + union md_node_info *b_node_info) +{ + if (a_node_info->vdev_port.id != b_node_info->vdev_port.id) + return false; + + if (a_node_info->vdev_port.parent_cfg_hdl != + b_node_info->vdev_port.parent_cfg_hdl) + return false; + + if (strncmp(a_node_info->vdev_port.name, + b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0) + return false; + + return true; +} + +static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, + union md_node_info *node_info) +{ + const u64 *idp; + + /* DS port nodes use the "id" property to distinguish them */ + idp = mdesc_get_property(md, node, "id", NULL); + if (!idp) + return -1; + + node_info->ds_port.id = *idp; + + return 0; +} + +static void rel_ds_port_node_info(union md_node_info *node_info) +{ +} + +static bool ds_port_node_match(union md_node_info *a_node_info, + union md_node_info *b_node_info) +{ + if (a_node_info->ds_port.id != b_node_info->ds_port.id) + return false; + + return true; +} + +/* Run 'func' on nodes which are in A but not in B. */ +static void invoke_on_missing(const char *name, + struct mdesc_handle *a, + struct mdesc_handle *b, + void (*func)(struct mdesc_handle *, u64, + const char *node_name)) +{ + mdesc_node_info_get_f get_info_func; + mdesc_node_info_rel_f rel_info_func; + mdesc_node_match_f node_match_func; + union md_node_info a_node_info; + union md_node_info b_node_info; + bool found; + u64 a_node; + u64 b_node; + int rv; + + /* + * Find the get_info, rel_info and node_match ops for the given + * node name + */ + mdesc_get_node_ops(name, &get_info_func, &rel_info_func, + &node_match_func); + + /* If we didn't find a match, the node type is not supported */ + if (!get_info_func || !rel_info_func || !node_match_func) { + pr_err("MD: %s node type is not supported\n", name); + return; + } + + mdesc_for_each_node_by_name(a, a_node, name) { + found = false; + + rv = get_info_func(a, a_node, &a_node_info); + if (rv != 0) { + pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", + name); + continue; + } + + /* Check each node in B for node matching a_node */ + mdesc_for_each_node_by_name(b, b_node, name) { + rv = get_info_func(b, b_node, &b_node_info); + if (rv != 0) + continue; + + if (node_match_func(&a_node_info, &b_node_info)) { + found = true; + rel_info_func(&b_node_info); + break; + } + + rel_info_func(&b_node_info); + } + + rel_info_func(&a_node_info); + + if (!found) + func(a, a_node, name); + } +} + +static void notify_one(struct mdesc_notifier_client *p, + struct mdesc_handle *old_hp, + struct mdesc_handle *new_hp) +{ + invoke_on_missing(p->node_name, old_hp, new_hp, p->remove); + invoke_on_missing(p->node_name, new_hp, old_hp, p->add); +} + +static void mdesc_notify_clients(struct mdesc_handle *old_hp, + struct mdesc_handle *new_hp) +{ + struct mdesc_notifier_client *p = client_list; + + while (p) { + notify_one(p, old_hp, new_hp); + p = p->next; + } +} + +void mdesc_update(void) +{ + unsigned long len, real_len, status; + struct mdesc_handle *hp, *orig_hp; + unsigned long flags; + + mutex_lock(&mdesc_mutex); + + (void) sun4v_mach_desc(0UL, 0UL, &len); + + hp = mdesc_alloc(len, &kmalloc_mdesc_memops); + if (!hp) { + printk(KERN_ERR "MD: mdesc alloc fails\n"); + goto out; + } + + status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); + if (status != HV_EOK || real_len > len) { + printk(KERN_ERR "MD: mdesc reread fails with %lu\n", + status); + refcount_dec(&hp->refcnt); + mdesc_free(hp); + goto out; + } + + spin_lock_irqsave(&mdesc_lock, flags); + orig_hp = cur_mdesc; + cur_mdesc = hp; + spin_unlock_irqrestore(&mdesc_lock, flags); + + mdesc_notify_clients(orig_hp, hp); + + spin_lock_irqsave(&mdesc_lock, flags); + if (refcount_dec_and_test(&orig_hp->refcnt)) + mdesc_free(orig_hp); + else + list_add(&orig_hp->list, &mdesc_zombie_list); + spin_unlock_irqrestore(&mdesc_lock, flags); + +out: + mutex_unlock(&mdesc_mutex); +} + +u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name, + union md_node_info *node_info) +{ + mdesc_node_info_get_f get_info_func; + mdesc_node_info_rel_f rel_info_func; + mdesc_node_match_f node_match_func; + union md_node_info hp_node_info; + u64 hp_node; + int rv; + + if (hp == NULL || node_name == NULL || node_info == NULL) + return MDESC_NODE_NULL; + + /* Find the ops for the given node name */ + mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func, + &node_match_func); + + /* If we didn't find ops for the given node name, it is not supported */ + if (!get_info_func || !rel_info_func || !node_match_func) { + pr_err("MD: %s node is not supported\n", node_name); + return -EINVAL; + } + + mdesc_for_each_node_by_name(hp, hp_node, node_name) { + rv = get_info_func(hp, hp_node, &hp_node_info); + if (rv != 0) + continue; + + if (node_match_func(node_info, &hp_node_info)) + break; + + rel_info_func(&hp_node_info); + } + + rel_info_func(&hp_node_info); + + return hp_node; +} +EXPORT_SYMBOL(mdesc_get_node); + +int mdesc_get_node_info(struct mdesc_handle *hp, u64 node, + const char *node_name, union md_node_info *node_info) +{ + mdesc_node_info_get_f get_info_func; + int rv; + + if (hp == NULL || node == MDESC_NODE_NULL || + node_name == NULL || node_info == NULL) + return -EINVAL; + + /* Find the get_info op for the given node name */ + mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL); + + /* If we didn't find a get_info_func, the node name is not supported */ + if (get_info_func == NULL) { + pr_err("MD: %s node is not supported\n", node_name); + return -EINVAL; + } + + rv = get_info_func(hp, node, node_info); + if (rv != 0) { + pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", + node_name); + return -1; + } + + return 0; +} +EXPORT_SYMBOL(mdesc_get_node_info); + +static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc) +{ + return (struct mdesc_elem *) mdesc->data; +} + +static void *name_block(struct mdesc_hdr *mdesc) +{ + return ((void *) node_block(mdesc)) + mdesc->node_sz; +} + +static void *data_block(struct mdesc_hdr *mdesc) +{ + return ((void *) name_block(mdesc)) + mdesc->name_sz; +} + +u64 mdesc_node_by_name(struct mdesc_handle *hp, + u64 from_node, const char *name) +{ + struct mdesc_elem *ep = node_block(&hp->mdesc); + const char *names = name_block(&hp->mdesc); + u64 last_node = hp->mdesc.node_sz / 16; + u64 ret; + + if (from_node == MDESC_NODE_NULL) { + ret = from_node = 0; + } else if (from_node >= last_node) { + return MDESC_NODE_NULL; + } else { + ret = ep[from_node].d.val; + } + + while (ret < last_node) { + if (ep[ret].tag != MD_NODE) + return MDESC_NODE_NULL; + if (!strcmp(names + ep[ret].name_offset, name)) + break; + ret = ep[ret].d.val; + } + if (ret >= last_node) + ret = MDESC_NODE_NULL; + return ret; +} +EXPORT_SYMBOL(mdesc_node_by_name); + +const void *mdesc_get_property(struct mdesc_handle *hp, u64 node, + const char *name, int *lenp) +{ + const char *names = name_block(&hp->mdesc); + u64 last_node = hp->mdesc.node_sz / 16; + void *data = data_block(&hp->mdesc); + struct mdesc_elem *ep; + + if (node == MDESC_NODE_NULL || node >= last_node) + return NULL; + + ep = node_block(&hp->mdesc) + node; + ep++; + for (; ep->tag != MD_NODE_END; ep++) { + void *val = NULL; + int len = 0; + + switch (ep->tag) { + case MD_PROP_VAL: + val = &ep->d.val; + len = 8; + break; + + case MD_PROP_STR: + case MD_PROP_DATA: + val = data + ep->d.data.data_offset; + len = ep->d.data.data_len; + break; + + default: + break; + } + if (!val) + continue; + + if (!strcmp(names + ep->name_offset, name)) { + if (lenp) + *lenp = len; + return val; + } + } + + return NULL; +} +EXPORT_SYMBOL(mdesc_get_property); + +u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type) +{ + struct mdesc_elem *ep, *base = node_block(&hp->mdesc); + const char *names = name_block(&hp->mdesc); + u64 last_node = hp->mdesc.node_sz / 16; + + if (from == MDESC_NODE_NULL || from >= last_node) + return MDESC_NODE_NULL; + + ep = base + from; + + ep++; + for (; ep->tag != MD_NODE_END; ep++) { + if (ep->tag != MD_PROP_ARC) + continue; + + if (strcmp(names + ep->name_offset, arc_type)) + continue; + + return ep - base; + } + + return MDESC_NODE_NULL; +} +EXPORT_SYMBOL(mdesc_next_arc); + +u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc) +{ + struct mdesc_elem *ep, *base = node_block(&hp->mdesc); + + ep = base + arc; + + return ep->d.val; +} +EXPORT_SYMBOL(mdesc_arc_target); + +const char *mdesc_node_name(struct mdesc_handle *hp, u64 node) +{ + struct mdesc_elem *ep, *base = node_block(&hp->mdesc); + const char *names = name_block(&hp->mdesc); + u64 last_node = hp->mdesc.node_sz / 16; + + if (node == MDESC_NODE_NULL || node >= last_node) + return NULL; + + ep = base + node; + if (ep->tag != MD_NODE) + return NULL; + + return names + ep->name_offset; +} +EXPORT_SYMBOL(mdesc_node_name); + +static u64 max_cpus = 64; + +static void __init report_platform_properties(void) +{ + struct mdesc_handle *hp = mdesc_grab(); + u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); + const char *s; + const u64 *v; + + if (pn == MDESC_NODE_NULL) { + prom_printf("No platform node in machine-description.\n"); + prom_halt(); + } + + s = mdesc_get_property(hp, pn, "banner-name", NULL); + printk("PLATFORM: banner-name [%s]\n", s); + s = mdesc_get_property(hp, pn, "name", NULL); + printk("PLATFORM: name [%s]\n", s); + + v = mdesc_get_property(hp, pn, "hostid", NULL); + if (v) + printk("PLATFORM: hostid [%08llx]\n", *v); + v = mdesc_get_property(hp, pn, "serial#", NULL); + if (v) + printk("PLATFORM: serial# [%08llx]\n", *v); + v = mdesc_get_property(hp, pn, "stick-frequency", NULL); + printk("PLATFORM: stick-frequency [%08llx]\n", *v); + v = mdesc_get_property(hp, pn, "mac-address", NULL); + if (v) + printk("PLATFORM: mac-address [%llx]\n", *v); + v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); + if (v) + printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v); + v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); + if (v) + printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v); + v = mdesc_get_property(hp, pn, "max-cpus", NULL); + if (v) { + max_cpus = *v; + printk("PLATFORM: max-cpus [%llu]\n", max_cpus); + } + +#ifdef CONFIG_SMP + { + int max_cpu, i; + + if (v) { + max_cpu = *v; + if (max_cpu > NR_CPUS) + max_cpu = NR_CPUS; + } else { + max_cpu = NR_CPUS; + } + for (i = 0; i < max_cpu; i++) + set_cpu_possible(i, true); + } +#endif + + mdesc_release(hp); +} + +static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp) +{ + const u64 *level = mdesc_get_property(hp, mp, "level", NULL); + const u64 *size = mdesc_get_property(hp, mp, "size", NULL); + const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL); + const char *type; + int type_len; + + type = mdesc_get_property(hp, mp, "type", &type_len); + + switch (*level) { + case 1: + if (of_find_in_proplist(type, "instn", type_len)) { + c->icache_size = *size; + c->icache_line_size = *line_size; + } else if (of_find_in_proplist(type, "data", type_len)) { + c->dcache_size = *size; + c->dcache_line_size = *line_size; + } + break; + + case 2: + c->ecache_size = *size; + c->ecache_line_size = *line_size; + break; + + default: + break; + } + + if (*level == 1) { + u64 a; + + mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { + u64 target = mdesc_arc_target(hp, a); + const char *name = mdesc_node_name(hp, target); + + if (!strcmp(name, "cache")) + fill_in_one_cache(c, hp, target); + } + } +} + +static void find_back_node_value(struct mdesc_handle *hp, u64 node, + char *srch_val, + void (*func)(struct mdesc_handle *, u64, int), + u64 val, int depth) +{ + u64 arc; + + /* Since we have an estimate of recursion depth, do a sanity check. */ + if (depth == 0) + return; + + mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) { + u64 n = mdesc_arc_target(hp, arc); + const char *name = mdesc_node_name(hp, n); + + if (!strcmp(srch_val, name)) + (*func)(hp, n, val); + + find_back_node_value(hp, n, srch_val, func, val, depth-1); + } +} + +static void __mark_core_id(struct mdesc_handle *hp, u64 node, + int core_id) +{ + const u64 *id = mdesc_get_property(hp, node, "id", NULL); + + if (*id < num_possible_cpus()) + cpu_data(*id).core_id = core_id; +} + +static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node, + int max_cache_id) +{ + const u64 *id = mdesc_get_property(hp, node, "id", NULL); + + if (*id < num_possible_cpus()) { + cpu_data(*id).max_cache_id = max_cache_id; + + /** + * On systems without explicit socket descriptions socket + * is max_cache_id + */ + cpu_data(*id).sock_id = max_cache_id; + } +} + +static void mark_core_ids(struct mdesc_handle *hp, u64 mp, + int core_id) +{ + find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10); +} + +static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp, + int max_cache_id) +{ + find_back_node_value(hp, mp, "cpu", __mark_max_cache_id, + max_cache_id, 10); +} + +static void set_core_ids(struct mdesc_handle *hp) +{ + int idx; + u64 mp; + + idx = 1; + + /* Identify unique cores by looking for cpus backpointed to by + * level 1 instruction caches. + */ + mdesc_for_each_node_by_name(hp, mp, "cache") { + const u64 *level; + const char *type; + int len; + + level = mdesc_get_property(hp, mp, "level", NULL); + if (*level != 1) + continue; + + type = mdesc_get_property(hp, mp, "type", &len); + if (!of_find_in_proplist(type, "instn", len)) + continue; + + mark_core_ids(hp, mp, idx); + idx++; + } +} + +static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level) +{ + u64 mp; + int idx = 1; + int fnd = 0; + + /** + * Identify unique highest level of shared cache by looking for cpus + * backpointed to by shared level N caches. + */ + mdesc_for_each_node_by_name(hp, mp, "cache") { + const u64 *cur_lvl; + + cur_lvl = mdesc_get_property(hp, mp, "level", NULL); + if (*cur_lvl != level) + continue; + mark_max_cache_ids(hp, mp, idx); + idx++; + fnd = 1; + } + return fnd; +} + +static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp) +{ + int idx = 1; + + mdesc_for_each_node_by_name(hp, mp, "socket") { + u64 a; + + mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { + u64 t = mdesc_arc_target(hp, a); + const char *name; + const u64 *id; + + name = mdesc_node_name(hp, t); + if (strcmp(name, "cpu")) + continue; + + id = mdesc_get_property(hp, t, "id", NULL); + if (*id < num_possible_cpus()) + cpu_data(*id).sock_id = idx; + } + idx++; + } +} + +static void set_sock_ids(struct mdesc_handle *hp) +{ + u64 mp; + + /** + * Find the highest level of shared cache which pre-T7 is also + * the socket. + */ + if (!set_max_cache_ids_by_cache(hp, 3)) + set_max_cache_ids_by_cache(hp, 2); + + /* If machine description exposes sockets data use it.*/ + mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets"); + if (mp != MDESC_NODE_NULL) + set_sock_ids_by_socket(hp, mp); +} + +static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) +{ + u64 a; + + mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { + u64 t = mdesc_arc_target(hp, a); + const char *name; + const u64 *id; + + name = mdesc_node_name(hp, t); + if (strcmp(name, "cpu")) + continue; + + id = mdesc_get_property(hp, t, "id", NULL); + if (*id < NR_CPUS) + cpu_data(*id).proc_id = proc_id; + } +} + +static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) +{ + int idx; + u64 mp; + + idx = 0; + mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { + const char *type; + int len; + + type = mdesc_get_property(hp, mp, "type", &len); + if (!of_find_in_proplist(type, "int", len) && + !of_find_in_proplist(type, "integer", len)) + continue; + + mark_proc_ids(hp, mp, idx); + idx++; + } +} + +static void set_proc_ids(struct mdesc_handle *hp) +{ + __set_proc_ids(hp, "exec_unit"); + __set_proc_ids(hp, "exec-unit"); +} + +static void get_one_mondo_bits(const u64 *p, unsigned int *mask, + unsigned long def, unsigned long max) +{ + u64 val; + + if (!p) + goto use_default; + val = *p; + + if (!val || val >= 64) + goto use_default; + + if (val > max) + val = max; + + *mask = ((1U << val) * 64U) - 1U; + return; + +use_default: + *mask = ((1U << def) * 64U) - 1U; +} + +static void get_mondo_data(struct mdesc_handle *hp, u64 mp, + struct trap_per_cpu *tb) +{ + static int printed; + const u64 *val; + + val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); + get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2)); + + val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); + get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8); + + val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); + get_one_mondo_bits(val, &tb->resum_qmask, 6, 7); + + val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); + get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2); + if (!printed++) { + pr_info("SUN4V: Mondo queue sizes " + "[cpu(%u) dev(%u) r(%u) nr(%u)]\n", + tb->cpu_mondo_qmask + 1, + tb->dev_mondo_qmask + 1, + tb->resum_qmask + 1, + tb->nonresum_qmask + 1); + } +} + +static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) +{ + struct mdesc_handle *hp = mdesc_grab(); + void *ret = NULL; + u64 mp; + + mdesc_for_each_node_by_name(hp, mp, "cpu") { + const u64 *id = mdesc_get_property(hp, mp, "id", NULL); + int cpuid = *id; + +#ifdef CONFIG_SMP + if (cpuid >= NR_CPUS) { + printk(KERN_WARNING "Ignoring CPU %d which is " + ">= NR_CPUS (%d)\n", + cpuid, NR_CPUS); + continue; + } + if (!cpumask_test_cpu(cpuid, mask)) + continue; +#endif + + ret = func(hp, mp, cpuid, arg); + if (ret) + goto out; + } +out: + mdesc_release(hp); + return ret; +} + +static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, + void *arg) +{ + ncpus_probed++; +#ifdef CONFIG_SMP + set_cpu_present(cpuid, true); +#endif + return NULL; +} + +void mdesc_populate_present_mask(cpumask_t *mask) +{ + if (tlb_type != hypervisor) + return; + + ncpus_probed = 0; + mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); +} + +static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) +{ + const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); + unsigned long *pgsz_mask = arg; + u64 val; + + val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | + HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); + if (pgsz_prop) + val = *pgsz_prop; + + if (!*pgsz_mask) + *pgsz_mask = val; + else + *pgsz_mask &= val; + return NULL; +} + +void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) +{ + *pgsz_mask = 0; + mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); +} + +static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, + void *arg) +{ + const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); + struct trap_per_cpu *tb; + cpuinfo_sparc *c; + u64 a; + +#ifndef CONFIG_SMP + /* On uniprocessor we only want the values for the + * real physical cpu the kernel booted onto, however + * cpu_data() only has one entry at index 0. + */ + if (cpuid != real_hard_smp_processor_id()) + return NULL; + cpuid = 0; +#endif + + c = &cpu_data(cpuid); + c->clock_tick = *cfreq; + + tb = &trap_block[cpuid]; + get_mondo_data(hp, mp, tb); + + mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { + u64 j, t = mdesc_arc_target(hp, a); + const char *t_name; + + t_name = mdesc_node_name(hp, t); + if (!strcmp(t_name, "cache")) { + fill_in_one_cache(c, hp, t); + continue; + } + + mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { + u64 n = mdesc_arc_target(hp, j); + const char *n_name; + + n_name = mdesc_node_name(hp, n); + if (!strcmp(n_name, "cache")) + fill_in_one_cache(c, hp, n); + } + } + + c->core_id = 0; + c->proc_id = -1; + + return NULL; +} + +void mdesc_fill_in_cpu_data(cpumask_t *mask) +{ + struct mdesc_handle *hp; + + mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); + + hp = mdesc_grab(); + + set_core_ids(hp); + set_proc_ids(hp); + set_sock_ids(hp); + + mdesc_release(hp); + + smp_fill_in_sib_core_maps(); +} + +/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is + * opened. Hold this reference until /dev/mdesc is closed to ensure + * mdesc data structure is not released underneath us. Store the + * pointer to mdesc structure in private_data for read and seek to use + */ +static int mdesc_open(struct inode *inode, struct file *file) +{ + struct mdesc_handle *hp = mdesc_grab(); + + if (!hp) + return -ENODEV; + + file->private_data = hp; + + return 0; +} + +static ssize_t mdesc_read(struct file *file, char __user *buf, + size_t len, loff_t *offp) +{ + struct mdesc_handle *hp = file->private_data; + unsigned char *mdesc; + int bytes_left, count = len; + + if (*offp >= hp->handle_size) + return 0; + + bytes_left = hp->handle_size - *offp; + if (count > bytes_left) + count = bytes_left; + + mdesc = (unsigned char *)&hp->mdesc; + mdesc += *offp; + if (!copy_to_user(buf, mdesc, count)) { + *offp += count; + return count; + } else { + return -EFAULT; + } +} + +static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) +{ + struct mdesc_handle *hp = file->private_data; + + return no_seek_end_llseek_size(file, offset, whence, hp->handle_size); +} + +/* mdesc_close() - /dev/mdesc is being closed, release the reference to + * mdesc structure. + */ +static int mdesc_close(struct inode *inode, struct file *file) +{ + mdesc_release(file->private_data); + return 0; +} + +static const struct file_operations mdesc_fops = { + .open = mdesc_open, + .read = mdesc_read, + .llseek = mdesc_llseek, + .release = mdesc_close, + .owner = THIS_MODULE, +}; + +static struct miscdevice mdesc_misc = { + .minor = MISC_DYNAMIC_MINOR, + .name = "mdesc", + .fops = &mdesc_fops, +}; + +static int __init mdesc_misc_init(void) +{ + return misc_register(&mdesc_misc); +} + +__initcall(mdesc_misc_init); + +void __init sun4v_mdesc_init(void) +{ + struct mdesc_handle *hp; + unsigned long len, real_len, status; + + (void) sun4v_mach_desc(0UL, 0UL, &len); + + printk("MDESC: Size is %lu bytes.\n", len); + + hp = mdesc_alloc(len, &memblock_mdesc_ops); + if (hp == NULL) { + prom_printf("MDESC: alloc of %lu bytes failed.\n", len); + prom_halt(); + } + + status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); + if (status != HV_EOK || real_len > len) { + prom_printf("sun4v_mach_desc fails, err(%lu), " + "len(%lu), real_len(%lu)\n", + status, len, real_len); + mdesc_free(hp); + prom_halt(); + } + + cur_mdesc = hp; + + mdesc_adi_init(); + report_platform_properties(); +} |